The Schulcan Aruch ( or Babylonian Talmud ) has several passages on what to do about blood,not only for handling blood,but even what to do about women ( considered unclean ) who are menstruating.

If my memory serves me,Jews who followed the Baby Tal were not to enter rivers or bathing areas where women experiencing their monthly visitor may have entered. They were encouraged to avoid them as much as possible which goes to show what sort of "rules" or "guidelines" rank and file Jews,not to mention enforcers of Jewish law like shochets, were obligated to follow.

Of course,the elaboration on handling animal blood by shochets is mentioned in detail.